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Activated carbon made from coconut shells is highly valued for its excellent adsorption properties, especially in applications like water purification, air filtration, and gas purification. Here’s a breakdown of its key characteristics:
1. Raw Material: Coconut Shell
Coconut shell is a renewable and sustainable resource, making it an eco-friendly choice for activated carbon production.
The dense structure of coconut shells results in activated carbon with a high microporosity, which enhances its adsorption capacity.
2. Granular Size
Granular activated carbon (GAC) made from coconut shells typically has a particle size ranging from 0.2 mm to 5 mm.
The granular form is ideal for use in fixed-bed filters, where it provides a large surface area for adsorption and allows for efficient fluid flow.
3. High Adsorption Value
Coconut shell activated carbon has a high surface area (typically 1000–1500 m²/g), which contributes to its superior adsorption capabilities.
It is particularly effective at adsorbing organic compounds, chlorine, volatile organic compounds (VOCs), and odors.
Its microporous structure makes it highly efficient for removing small molecules and contaminants.
4. Applications
Water Treatment: Removes impurities, chlorine, and organic contaminants from drinking water and wastewater.
Air Purification: Used in air filters to capture VOCs, odors, and harmful gases.
Gold Recovery: Utilized in the mining industry for gold extraction due to its high adsorption efficiency.
Food and Beverage Industry: Used for decolorization and purification processes.
5. Advantages
High Hardness: Coconut shell activated carbon has a high mechanical strength, reducing the risk of breakdown during use.
Low Ash Content: Typically less than 5%, making it suitable for high-purity applications.
Renewable and Sustainable: Coconut shells are a byproduct of the coconut industry, making this type of activated carbon environmentally friendly.
6. Quality Indicators
Iodine Number: A measure of adsorption capacity, typically 1000–1200 mg/g for high-quality coconut shell activated carbon.
Methylene Blue Value: Indicates the ability to adsorb larger molecules, usually 100–200 mg/g.
Moisture Content: Typically less than 5% for optimal performance.
7. Regeneration
Coconut shell activated carbon can often be regenerated (reactivated) through thermal or chemical processes, extending its lifespan and reducing costs.
